Question

which type of cell transport requires atp? *
a) osmosis
b) diffusion
c) active transport
d) facilitated diffusion

which describes ions being moved against their concentration gradient? *
a) diffusion
b) active transport
c) osmosis
d) facilitated diffusion

Explanation:

First Question:

• Osmosis (A) is water diffusion, no ATP.
• Diffusion (B) is passive, moves down gradient, no ATP.
• Active Transport (C) needs energy (ATP) to move substances against concentration gradient.
• Facilitated Diffusion (D) is passive with a protein, no ATP.

Second Question:

• Diffusion (A) moves down gradient, not against.
• Active Transport (B) moves substances (including ions) against their concentration gradient, using energy.
• Osmosis (C) is water movement, not ion transport against gradient.
• Facilitated Diffusion (D) moves down gradient, no energy for against - gradient ion movement.

Answer:

C) Active Transport